How could Whey Protein Dairy with DHA aid in digestion & softer stools?

Research has shown that soft stools are common in children fed either whey- or casein-predominant formulas. However, pediatric nutrition research has reported more children receiving whey-predominant formulas passing softer or more watery stools than did children receiving casein-predominant formulas.1 This could be the result of whey-predominant formulas helping to produce a stool bacteria population similar to that of a breast-fed child and/or due to the fact that whey proteins move more quickly through the stomach than casein.2,3